for building use, BigSky TruckNStuff offers the Wilson Cellular
Wide Band Log Periodic Directional Antenna. This Wide-Band
Directional Antenna collects the cell tower signal and sends
it through the cable to a cell phone, amplifier or cellular
data card. When the cell phone or data card transmits, the
signal is transferred to an amplifier or directly to the antenna
and broadcast back to the cell tower.
focusing its signal in one direction, the multi-band Yagi
antenna provides a greater signal gain, and covers the entire
spectrum from 800 MHz to 2.5 GHz.